1188870401 has 16 divisors (see below), whose sum is σ = 1294015824. Its totient is φ = 1088016384.

The previous prime is 1188870373. The next prime is 1188870409. The reversal of 1188870401 is 1040788811.

It is a Cunningham number, because it is equal to 34480²+1.

It can be written as a sum of positive squares in 8 ways, for example, as 20939776 + 1167930625 = 4576^2 + 34175^2 .

It is a cyclic number.

It is not a de Polignac number, because 1188870401 - 2¹⁸ = 1188608257 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1188870409) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 95975 + ... + 107651.

It is an arithmetic number, because the mean of its divisors is an integer number (80875989).

Almost surely, 2^1188870401 is an apocalyptic number.

It is an amenable number.

1188870401 is a deficient number, since it is larger than the sum of its proper divisors (105145423).

1188870401 is a wasteful number, since it uses less digits than its factorization.

1188870401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11860.

The product of its (nonzero) digits is 14336, while the sum is 38.

The square root of 1188870401 is about 34480.0000145012. Note that the first 4 decimals coincide. The cubic root of 1188870401 is about 1059.3630922293.

The spelling of 1188870401 in words is "one billion, one hundred eighty-eight million, eight hundred seventy thousand, four hundred one".